RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Brett (Main Reaches)

Largest measured gudgeon: 14.2 cm

The largest gudgeon measured in Environment Agency surveys of the River Brett (Main Reaches) was 14.2 cm, recorded at Waterhouse Farm on 11 April 2014.

Across 2,542 measured gudgeon, the median measured length was 9 cm.

Surveyors recorded weights for 2 gudgeon. The median was 0.6 oz (0.016 kg) and the largest recorded weight was 0.7 oz (0.021 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Brett (Main Reaches).

See gudgeon records across England →

Most recent observation9 April 2026Waterhouse Farm · 9 fish
Largest measured gudgeon
14.2 cm
Median length
9 cm
Fish measured
2,542
Survey locations
14

Individual EA measurements

Largest measured gudgeon

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
14.2 cm11 Apr 2014Waterhouse Farm140720
14 cm20 Mar 1991Chelsworth13747
14 cm11 Mar 1988Chelsworth13735
13.8 cm25 Sept 2013Semer A140032
13.7 cm20 Apr 2016Waterhouse Farm148016
13.7 cm25 Sept 2013Semer A140032
13.4 cm20 Mar 1991Chelsworth13747
13.3 cm25 Sept 2013Peyton Hall140035
13.3 cm22 Feb 1988Cobbolds Mill13736
13.2 cm7 Apr 2006Hadleigh Town90601

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where gudgeon were found

Each point marks a survey location with at least one gudgeon record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding gudgeon
Waterhouse Farm11 Jan 19859 Apr 202614
Higham FGS20 Nov 19847 Apr 202615
Hadleigh Town9 Mar 198226 Apr 202410
Cosford Bridge19 Dec 198413 Apr 20187
Hadleigh STW7 Jan 198530 Sept 20137
Semer A14 Dec 198425 Sept 20138
Peyton Hall20 Dec 198425 Sept 20138
Cherry Hill26 Feb 198820 Apr 20066
Chelsworth11 Mar 198813 Apr 20066
Downstream Mill Farm25 Mar 19825 Apr 20068
Upstream Mill Farm3 Apr 199129 Mar 20064
Cobbolds Mill20 Mar 19857 Apr 20006
Semer B (Dairy Farm - River Brett)13 Dec 198413 Dec 19841
Bridge Farm Chelsworth12 Feb 198212 Feb 19821

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

1982–2026

Survey records by year

Each bar shows how many survey visits recorded gudgeon that year.

Fish measured by surveyors

Measured length distribution

See how the 2,542 measured fish were spread across different length ranges.

Smallest
2.7 cm
Lower quarter
7.7 cm
Median
9 cm
Upper quarter
10 cm
Largest
14.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 2 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.4 oz (0.011 kg)
Lower quarter
0.5 oz (0.0135 kg)
Median
0.6 oz (0.016 kg)
Upper quarter
0.7 oz (0.0185 kg)
Heaviest
0.7 oz (0.021 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Brett (Main Reaches)

Compare other species with enough survey and measurement data for a detailed page.

European eel Pike Roach Dace Perch Bullhead

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →